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diff --git a/clang/lib/Frontend/MultiplexConsumer.cpp b/clang/lib/Frontend/MultiplexConsumer.cpp
new file mode 100644
index 000000000000..04e896296c95
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+++ b/clang/lib/Frontend/MultiplexConsumer.cpp
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+//===- MultiplexConsumer.cpp - AST Consumer for PCH Generation --*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the MultiplexConsumer class. It also declares and defines
+//  MultiplexASTDeserializationListener and  MultiplexASTMutationListener, which
+//  are implementation details of MultiplexConsumer.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/MultiplexConsumer.h"
+#include "clang/AST/ASTMutationListener.h"
+#include "clang/AST/DeclGroup.h"
+
+using namespace clang;
+
+namespace clang {
+
+MultiplexASTDeserializationListener::MultiplexASTDeserializationListener(
+      const std::vector<ASTDeserializationListener*>& L)
+    : Listeners(L) {
+}
+
+void MultiplexASTDeserializationListener::ReaderInitialized(
+    ASTReader *Reader) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->ReaderInitialized(Reader);
+}
+
+void MultiplexASTDeserializationListener::IdentifierRead(
+    serialization::IdentID ID, IdentifierInfo *II) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->IdentifierRead(ID, II);
+}
+
+void MultiplexASTDeserializationListener::MacroRead(
+    serialization::MacroID ID, MacroInfo *MI) {
+  for (auto &Listener : Listeners)
+    Listener->MacroRead(ID, MI);
+}
+
+void MultiplexASTDeserializationListener::TypeRead(
+    serialization::TypeIdx Idx, QualType T) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->TypeRead(Idx, T);
+}
+
+void MultiplexASTDeserializationListener::DeclRead(
+    serialization::DeclID ID, const Decl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DeclRead(ID, D);
+}
+
+void MultiplexASTDeserializationListener::SelectorRead(
+    serialization::SelectorID ID, Selector Sel) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->SelectorRead(ID, Sel);
+}
+
+void MultiplexASTDeserializationListener::MacroDefinitionRead(
+    serialization::PreprocessedEntityID ID, MacroDefinitionRecord *MD) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->MacroDefinitionRead(ID, MD);
+}
+
+void MultiplexASTDeserializationListener::ModuleRead(
+    serialization::SubmoduleID ID, Module *Mod) {
+  for (auto &Listener : Listeners)
+    Listener->ModuleRead(ID, Mod);
+}
+
+// This ASTMutationListener forwards its notifications to a set of
+// child listeners.
+class MultiplexASTMutationListener : public ASTMutationListener {
+public:
+  // Does NOT take ownership of the elements in L.
+  MultiplexASTMutationListener(ArrayRef<ASTMutationListener*> L);
+  void CompletedTagDefinition(const TagDecl *D) override;
+  void AddedVisibleDecl(const DeclContext *DC, const Decl *D) override;
+  void AddedCXXImplicitMember(const CXXRecordDecl *RD, const Decl *D) override;
+  void AddedCXXTemplateSpecialization(const ClassTemplateDecl *TD,
+                            const ClassTemplateSpecializationDecl *D) override;
+  void AddedCXXTemplateSpecialization(const VarTemplateDecl *TD,
+                               const VarTemplateSpecializationDecl *D) override;
+  void AddedCXXTemplateSpecialization(const FunctionTemplateDecl *TD,
+                                      const FunctionDecl *D) override;
+  void ResolvedExceptionSpec(const FunctionDecl *FD) override;
+  void DeducedReturnType(const FunctionDecl *FD, QualType ReturnType) override;
+  void ResolvedOperatorDelete(const CXXDestructorDecl *DD,
+                              const FunctionDecl *Delete,
+                              Expr *ThisArg) override;
+  void CompletedImplicitDefinition(const FunctionDecl *D) override;
+  void InstantiationRequested(const ValueDecl *D) override;
+  void VariableDefinitionInstantiated(const VarDecl *D) override;
+  void FunctionDefinitionInstantiated(const FunctionDecl *D) override;
+  void DefaultArgumentInstantiated(const ParmVarDecl *D) override;
+  void DefaultMemberInitializerInstantiated(const FieldDecl *D) override;
+  void AddedObjCCategoryToInterface(const ObjCCategoryDecl *CatD,
+                                    const ObjCInterfaceDecl *IFD) override;
+  void DeclarationMarkedUsed(const Decl *D) override;
+  void DeclarationMarkedOpenMPThreadPrivate(const Decl *D) override;
+  void DeclarationMarkedOpenMPAllocate(const Decl *D, const Attr *A) override;
+  void DeclarationMarkedOpenMPDeclareTarget(const Decl *D,
+                                            const Attr *Attr) override;
+  void RedefinedHiddenDefinition(const NamedDecl *D, Module *M) override;
+  void AddedAttributeToRecord(const Attr *Attr,
+                              const RecordDecl *Record) override;
+
+private:
+  std::vector<ASTMutationListener*> Listeners;
+};
+
+MultiplexASTMutationListener::MultiplexASTMutationListener(
+    ArrayRef<ASTMutationListener*> L)
+    : Listeners(L.begin(), L.end()) {
+}
+
+void MultiplexASTMutationListener::CompletedTagDefinition(const TagDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->CompletedTagDefinition(D);
+}
+
+void MultiplexASTMutationListener::AddedVisibleDecl(
+    const DeclContext *DC, const Decl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedVisibleDecl(DC, D);
+}
+
+void MultiplexASTMutationListener::AddedCXXImplicitMember(
+    const CXXRecordDecl *RD, const Decl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedCXXImplicitMember(RD, D);
+}
+void MultiplexASTMutationListener::AddedCXXTemplateSpecialization(
+    const ClassTemplateDecl *TD, const ClassTemplateSpecializationDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedCXXTemplateSpecialization(TD, D);
+}
+void MultiplexASTMutationListener::AddedCXXTemplateSpecialization(
+    const VarTemplateDecl *TD, const VarTemplateSpecializationDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedCXXTemplateSpecialization(TD, D);
+}
+void MultiplexASTMutationListener::AddedCXXTemplateSpecialization(
+    const FunctionTemplateDecl *TD, const FunctionDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedCXXTemplateSpecialization(TD, D);
+}
+void MultiplexASTMutationListener::ResolvedExceptionSpec(
+    const FunctionDecl *FD) {
+  for (auto &Listener : Listeners)
+    Listener->ResolvedExceptionSpec(FD);
+}
+void MultiplexASTMutationListener::DeducedReturnType(const FunctionDecl *FD,
+                                                     QualType ReturnType) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DeducedReturnType(FD, ReturnType);
+}
+void MultiplexASTMutationListener::ResolvedOperatorDelete(
+    const CXXDestructorDecl *DD, const FunctionDecl *Delete, Expr *ThisArg) {
+  for (auto *L : Listeners)
+    L->ResolvedOperatorDelete(DD, Delete, ThisArg);
+}
+void MultiplexASTMutationListener::CompletedImplicitDefinition(
+                                                        const FunctionDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->CompletedImplicitDefinition(D);
+}
+void MultiplexASTMutationListener::InstantiationRequested(const ValueDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->InstantiationRequested(D);
+}
+void MultiplexASTMutationListener::VariableDefinitionInstantiated(
+    const VarDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->VariableDefinitionInstantiated(D);
+}
+void MultiplexASTMutationListener::FunctionDefinitionInstantiated(
+    const FunctionDecl *D) {
+  for (auto &Listener : Listeners)
+    Listener->FunctionDefinitionInstantiated(D);
+}
+void MultiplexASTMutationListener::DefaultArgumentInstantiated(
+                                                         const ParmVarDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DefaultArgumentInstantiated(D);
+}
+void MultiplexASTMutationListener::DefaultMemberInitializerInstantiated(
+                                                           const FieldDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DefaultMemberInitializerInstantiated(D);
+}
+void MultiplexASTMutationListener::AddedObjCCategoryToInterface(
+                                                 const ObjCCategoryDecl *CatD,
+                                                 const ObjCInterfaceDecl *IFD) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedObjCCategoryToInterface(CatD, IFD);
+}
+void MultiplexASTMutationListener::DeclarationMarkedUsed(const Decl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DeclarationMarkedUsed(D);
+}
+void MultiplexASTMutationListener::DeclarationMarkedOpenMPThreadPrivate(
+    const Decl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DeclarationMarkedOpenMPThreadPrivate(D);
+}
+void MultiplexASTMutationListener::DeclarationMarkedOpenMPAllocate(
+    const Decl *D, const Attr *A) {
+  for (ASTMutationListener *L : Listeners)
+    L->DeclarationMarkedOpenMPAllocate(D, A);
+}
+void MultiplexASTMutationListener::DeclarationMarkedOpenMPDeclareTarget(
+    const Decl *D, const Attr *Attr) {
+  for (auto *L : Listeners)
+    L->DeclarationMarkedOpenMPDeclareTarget(D, Attr);
+}
+void MultiplexASTMutationListener::RedefinedHiddenDefinition(const NamedDecl *D,
+                                                             Module *M) {
+  for (auto *L : Listeners)
+    L->RedefinedHiddenDefinition(D, M);
+}
+
+void MultiplexASTMutationListener::AddedAttributeToRecord(
+                                                    const Attr *Attr,
+                                                    const RecordDecl *Record) {
+  for (auto *L : Listeners)
+    L->AddedAttributeToRecord(Attr, Record);
+}
+
+}  // end namespace clang
+
+MultiplexConsumer::MultiplexConsumer(
+    std::vector<std::unique_ptr<ASTConsumer>> C)
+    : Consumers(std::move(C)), MutationListener(), DeserializationListener() {
+  // Collect the mutation listeners and deserialization listeners of all
+  // children, and create a multiplex listener each if so.
+  std::vector<ASTMutationListener*> mutationListeners;
+  std::vector<ASTDeserializationListener*> serializationListeners;
+  for (auto &Consumer : Consumers) {
+    if (auto *mutationListener = Consumer->GetASTMutationListener())
+      mutationListeners.push_back(mutationListener);
+    if (auto *serializationListener = Consumer->GetASTDeserializationListener())
+      serializationListeners.push_back(serializationListener);
+  }
+  if (!mutationListeners.empty()) {
+    MutationListener =
+        std::make_unique<MultiplexASTMutationListener>(mutationListeners);
+  }
+  if (!serializationListeners.empty()) {
+    DeserializationListener =
+        std::make_unique<MultiplexASTDeserializationListener>(
+            serializationListeners);
+  }
+}
+
+MultiplexConsumer::~MultiplexConsumer() {}
+
+void MultiplexConsumer::Initialize(ASTContext &Context) {
+  for (auto &Consumer : Consumers)
+    Consumer->Initialize(Context);
+}
+
+bool MultiplexConsumer::HandleTopLevelDecl(DeclGroupRef D) {
+  bool Continue = true;
+  for (auto &Consumer : Consumers)
+    Continue = Continue && Consumer->HandleTopLevelDecl(D);
+  return Continue;
+}
+
+void MultiplexConsumer::HandleInlineFunctionDefinition(FunctionDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleInlineFunctionDefinition(D);
+}
+
+void MultiplexConsumer::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleCXXStaticMemberVarInstantiation(VD);
+}
+
+void MultiplexConsumer::HandleInterestingDecl(DeclGroupRef D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleInterestingDecl(D);
+}
+
+void MultiplexConsumer::HandleTranslationUnit(ASTContext &Ctx) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleTranslationUnit(Ctx);
+}
+
+void MultiplexConsumer::HandleTagDeclDefinition(TagDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleTagDeclDefinition(D);
+}
+
+void MultiplexConsumer::HandleTagDeclRequiredDefinition(const TagDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleTagDeclRequiredDefinition(D);
+}
+
+void MultiplexConsumer::HandleCXXImplicitFunctionInstantiation(FunctionDecl *D){
+  for (auto &Consumer : Consumers)
+    Consumer->HandleCXXImplicitFunctionInstantiation(D);
+}
+
+void MultiplexConsumer::HandleTopLevelDeclInObjCContainer(DeclGroupRef D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleTopLevelDeclInObjCContainer(D);
+}
+
+void MultiplexConsumer::HandleImplicitImportDecl(ImportDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleImplicitImportDecl(D);
+}
+
+void MultiplexConsumer::CompleteTentativeDefinition(VarDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->CompleteTentativeDefinition(D);
+}
+
+void MultiplexConsumer::AssignInheritanceModel(CXXRecordDecl *RD) {
+  for (auto &Consumer : Consumers)
+    Consumer->AssignInheritanceModel(RD);
+}
+
+void MultiplexConsumer::HandleVTable(CXXRecordDecl *RD) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleVTable(RD);
+}
+
+ASTMutationListener *MultiplexConsumer::GetASTMutationListener() {
+  return MutationListener.get();
+}
+
+ASTDeserializationListener *MultiplexConsumer::GetASTDeserializationListener() {
+  return DeserializationListener.get();
+}
+
+void MultiplexConsumer::PrintStats() {
+  for (auto &Consumer : Consumers)
+    Consumer->PrintStats();
+}
+
+bool MultiplexConsumer::shouldSkipFunctionBody(Decl *D) {
+  bool Skip = true;
+  for (auto &Consumer : Consumers)
+    Skip = Skip && Consumer->shouldSkipFunctionBody(D);
+  return Skip;
+}
+
+void MultiplexConsumer::InitializeSema(Sema &S) {
+  for (auto &Consumer : Consumers)
+    if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Consumer.get()))
+      SC->InitializeSema(S);
+}
+
+void MultiplexConsumer::ForgetSema() {
+  for (auto &Consumer : Consumers)
+    if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Consumer.get()))
+      SC->ForgetSema();
+}